1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e189954b28553b521a71d8c0e06c4ca0ac4b882b812b99ac9ad541d4ef1dd08. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec0a3df4-b498-4711-9c49-38ed1406470f.json and https://artists.proofprofile.net/proofs/artist/ec0a3df4-b498-4711-9c49-38ed1406470f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156b61df1e9db5d423dadb8f8619ecedcfeca162778adb2b3b1905eba90057f7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2177578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2776893fc589f4815e59b1c70ea3b3c7cd0b58a534114f8ab70ec736b0a3020. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92253359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138375c0ce50fdc416532871df8165f629160edd3ad44ecd0d8e54aa567ccc70. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2232070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18784f75c651f1661cef62f6a3d2dc45489744b0afead6d481740b9fd6ac23c1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42324698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bd2fb86c811f8de14dbdc8e00594488723d6187f1ec217dd23f031472cbf99. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42324699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dc1467c3479030167745846f8a5558b0df52184141cf28d6c5f30b256f39cf. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42324700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef38f9346dd6f9b813b900e1cc920e0ad612ff58b16c81d1cec4b5f82ed785e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN62353222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c1ae276d61aa1d348d62a7a62ffcb9929a6925f6c2b7454ad8aa73657b388a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6F2374674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066e66ff962a0ef405821ab55f0d77f513e50c2491397fbaefa37566746d6f52. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6F2374675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa079ece3ea2958ee5f17a1c82941c73f8e0878da8f5ebaa5e41cff2fb6d7a66e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2387732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3af0e92018adf56fb88240672268af4f05292b008a7dcefce544c0ffa6a1fa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2387733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20855bc8c6e810d080a6ad94a28404b4a01bcf667e7fa71714750ebcf66995cd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52392678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc054ed8e646be7a93da57f37bbbe16f95cca8611d801b5b0f69c93728f694f53. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2303088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad776c3686960687a0ad0c9117c048877f436473455faa53355822cf38c5c47b. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2303089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4bed3b740eb7e7f76f78579cc64b8bea03ca9cad9f621bb15a8986403e3257. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ32414536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57257cccd4f07b6571f72e0ae6107a7ccc30e887e28878678e72c037dbbf9d1. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2410282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15d847de9fcb87bf03d42a2da630dda4a0c6469da6d11230755021dc4e4af18. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2410288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8567ef046f29b77dcb83569051951cc72dd567512041629d1bb5b9a9d849affc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ62333756.